I'm the proud owner of a Magnetospeed V2 and I can't say enough good things about it. It's the finest, most accurate, most reliable chronograph I've ever used. The updated version, Magnetospeed V3, is even better. Now, what if the LabRadar set-up had been available when I bought the MS?
Here's my take on how I'd make the purchasing decision:
The MS does a great job. It's only draw back is that I can't use it to judge accuracy and velocity at the same time because, although the impacts on target still group reliably, it tends to increase the elevation of the group and I have to collect my MV data then adjust my zero if I make any changes in the load.
The MS costs about $380 and I can get one today.
The LabRadar claims to provide all of the same information I get from my MS, plus multiple samplings of velocity over about 100 yards. (The fact that it allegedly samples at a 4000 pulse per second rate doesn't impress me because it's only sampling a little more than about 400 pulses over the first hundred yards of travel and the rest of the trip to the long range target goes unregistered) But the LabRadar is not attached to the rifle so I can be confident in the validity of my recorded groups on target and the velocity at the same time.
The LabRadar will, I am lead to believe, sell for around $550 and although it's promised for release in the fall of this year I can't get a promised delivery date if I order it today.
Price difference of $170 is a bit of a hit for me but the greater flexibility in application makes me lean toward the LabRadar.
So LabRadar is where I'd go ..................